Multimeter ntsuas qhov kev sib raug zoo ntawm lub pointer deflection lub kaum sab xis thiab tsis kam
Thaum ntsuas qhov tsis kam, thov nco ntsoov:
1. Kev ntsuas qhov ntsuas yuav tsum raug tshem tawm ntawm lub voj voog ua ntej ntsuas.
2. Tsis txhob kov ob qhov kev sim ua ke ntev.
3. Tsis txhob kov cov hlau rods ntawm ob qhov kev xeem coj los yog ob tus pins ntawm qhov kev tiv thaiv raug ntsuas nrog ob txhais tes tib lub sijhawm. Nws yog qhov zoo tshaj los tuav ob qhov kev xeem coj tib lub sijhawm nrog koj sab tes xis.
4. Yog tias qhov chaw ohm tsis siv lub sijhawm ntev, lub roj teeb hauv lub ntsuas yuav tsum raug tshem tawm.
Thaum ib tug multimeter ntsuas tsis kam, ntsuas tus nqi xav tau ntawm lub 'meter' yog qhov tseeb tam sim no dhau los ntawm kev ntsuas qhov ntsuas. Qhov ntau dua qhov kev tiv thaiv raug ntsuas, qhov me me tam sim no, uas yog, qhov me me ntawm lub kaum sab xis deflection. Kev sib raug zoo ntawm lub pointer deflection lub kaum sab xis thiab ntsuas qhov tsis kam yog:
=(RZθ)/(RX+RZ)
Hauv cov qauv: ---pointer deflection lub kaum sab xis;
RZ-- nruab nrab tsis kam ntawm multimeter;
RX---Qhov ntsuas tsis kam;
θ---Lub kaum sab xis thaum lub pointer yog tag nrho deflected, lub kaum sab xis no feem ntau yog 90 degree
Nws tuaj yeem pom los ntawm ohm nplai ntawm multimeter tias nws qhov ntsuas yog qhov ntsuas tsis sib npaug. Qhov me me ntawm lub kaum sab xis deflection, qhov ntau dua qhov qhia tau hais tias tsis kam. Tus nqi tsis kam ntawm txhua kab kab ntawm qhov siab-kawg kawg yog sib txawv heev. Yog tias koj saib tus pointer ntawm ib lub kaum sab xis ntawm qhov ntsuas kab no thaum ntsuas, nws yuav ua rau muaj qhov yuam kev loj. Tshwj xeeb tshaj yog thaum ntsuas me me tsis kam, qhov yuam kev yog pom tseeb dua. Yog li ntawd, txhawm rau txhawm rau txhawm rau ntsuas qhov tseeb, thaum ntsuas qhov ua haujlwm me me, koj yuav tsum sim ua kom tus taw tes ze ze rau qhov chaw nruab nrab los ntawm kev hloov lub zog.
Kev ceev faj rau kev ntsuas qhov tseeb ntawm multimeter
(1) Khaws koj ob lub qhov muag perpendicular rau lub pointer thaum nyeem ntawv;
(2) Ua ntej ntsuas, tso lub multimeter horizontally thiab ua txhua yam xoom hloov kho;
(3) Thaum ntsuas kev tiv thaiv, xoom hloov yuav tsum tau ua txhua zaus koj hloov lub zog. Yog tias nws tsis tuaj yeem ncav cuag xoom, hloov lub roj teeb nrog ib qho tshiab;
(4) Thaum ntsuas qhov kev tawm tsam hauv RC Circuit Court, txiav tawm lub zog hluav taws xob hauv Circuit Court thiab tso tawm tag nrho cov hluav taws xob khaws cia hauv lub capacitor ua ntej ntsuas dua. Tom qab tsis suav nrog tib neeg kev nyeem ntawv yuam kev, peb ua qee qhov kev soj ntsuam ntawm lwm qhov yuam kev;
(5) Thaum ntsuas qhov tsis kam lossis qhov hluav taws xob siab, tsis txhob tuav cov hlau ib feem ntawm cov hlau lead nrog koj txhais tes kom tsis txhob shunting ntawm tib neeg lub cev tsis kam, nce kev ntsuas qhov yuam kev lossis ua rau hluav taws xob poob siab.
Digital multimeters, tseem hu ua digital multimeters (DMM), tuaj ntau hom thiab qauv. Txhua tus neeg ua haujlwm hauv hluav taws xob cia siab tias yuav muaj qhov zoo tshaj plaws digital multimeter. Muaj ntau lub hauv paus ntsiab lus rau kev xaiv digital multimeter, thiab qee zaum lawv kuj txawv ntawm ib tus neeg mus rau lwm tus. Tab sis rau ib tug handheld (pocket) digital multimeter, nws yuav tsum feem ntau muaj cov yam ntxwv hauv qab no: cov duab meej, siab raug, muaj zog daws teeb meem, kev sim ntau yam, ua tiav cov haujlwm, muaj peev xwm tiv thaiv kev cuam tshuam, ua tiav kev tiv thaiv Circuit Court, thiab zoo nkauj tsos, dav dav, yooj yim rau kev khiav lag luam, yoog raws, kev ntseeg tau zoo, kev siv hluav taws xob tsawg, yooj yim nqa, pheej yig thiab lwm yam.
